//
//  SinaNavigationViewController.swift
//  SinaWeiBo
//
//  Created by 王忠楠 on 16/9/19.
//  Copyright © 2016年 wangzn. All rights reserved.
//

import UIKit

class SinaNavigationViewController: UINavigationController ,UIGestureRecognizerDelegate{

    override func viewDidLoad() {
        super.viewDidLoad()

        //设置边缘手势代理
        self.interactivePopGestureRecognizer?.delegate = self
        
    }
    
    override func pushViewController(_ viewController: UIViewController, animated: Bool) {
        
        print(viewControllers.count)
        
        if viewControllers.count>0 {
            
            if viewControllers.count == 1 {
                
                let title = viewControllers.first!.title!
                
                viewController.navigationItem.leftBarButtonItem =
                    UIBarButtonItem(title: title, imageName: "navigationbar_back_withtext", target: self, action: #selector(backAction))
                
                
            }else{
                
                viewController.navigationItem.leftBarButtonItem =
                UIBarButtonItem(title: "返回", imageName: "navigationbar_back_withtext", target: self, action: #selector(backAction))
                
                
            }
            
            viewController.title = "当前显示的第\(viewControllers.count + 1)级控制器"
            //隐藏底部tabbar
            viewController.hidesBottomBarWhenPushed = true
            
        }
        
        super.pushViewController(viewController, animated: animated)
    }
    
    func backAction()  {
        popViewController(animated: true)
    }
    
    //是否处理这次开始点击的手势
    func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        //如果是根视图控制器的话,不处理边缘手势
        if viewControllers.count == 1 {
            return false
        }
        
        return true
        
    }
    
    
    
    
    
    
}
